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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Greslania circinata

HABIT Perennial; caespitose; clumped densely. Rhizomes short; pachymorph. Culms erect; 60–100(–300) cm long; 4–8 mm diam.; woody. Culm-internodes terete; hollow; 7 cm long; smooth; distally glabrous. Lateral branches lacking. Leaf-sheaths longer than adjacent culm internode; smooth; glabrous on surface. Ligule an eciliate membrane. Leaf-blade base broadly rounded; with a brief petiole-like connection to sheath. Leaf-blades deciduous at the ligule; lanceolate, or oblong; 7–29 cm long; 15–85 mm wide; coriaceous; stiff; glaucous. Leaf-blade midrib indistinct. Leaf-blade venation without cross veins. Leaf-blade apex acuminate, or attenuate; hardened.

INFLORESCENCE Synflorescence bractiferous; paniculate; 30–50 cm long; dense, or lax; with glumaceous subtending bracts; bracts 3–5 mm long; without axillary buds at base of spikelet; prophyllate below lateral spikelets.

Fertile spikelets pedicelled. Pedicels 3 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed, or subterete; 5–8 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 3 mm long; 0.6–0.8 length of upper glume; scarious; without keels; 7–9 -veined. Lower glume surface glabrous. Lower glume margins ciliate. Lower glume apex acuminate, or laterally pinched. Upper glume elliptic; 5 mm long; scarious; without keels; 7–9 -veined. Upper glume surface glabrous. Upper glume margins ciliate. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; 5–6 mm long; coriaceous; without keel; 5–7 -veined. Lemma apex obtuse, or acute; cucullate. Palea 1 length of lemma; coriaceous; 4–6 -veined. Palea keels approximate. Rhachilla extension 4 mm long; 0.6–0.7 length of fertile floret.

FLOWER Lodicules 3; 0.5–1.5 mm long; ciliate. Anthers 6. Stigmas 3. Ovary umbonate; glabrous.

FRUIT Caryopsis with adherent pericarp; 4.5 mm long.

DISTRIBUTION Pacific: southwestern.

NOTES Bambuseae. WDC 2007.

ADDITIONAL CHARACTERS Synflorescence branches curled.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.